My generator rpm's go up and down continuously when there is a constant load. This is not a refrigerator compressor kicking in or anything like that. For instance, it will do it with a fan running and a light on. The generator runs smoothly with no load. Any ideas ???
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the unit has gone into over load
The total power requirement has exceed the output of the generator
for example if the generator is a 2.500 kw or kva then it will generate well at 1.8 kva or kw but it will not run forever at 2.5 kva -kw
When a ac is running the power requirement will be constant on the generator and with the fridge as well then the load will be at the maximum out put of the unit.
when the fridge starts again the extra load will exceed the max out put of the generator and it will slow down ( lights dimming ) and eventually go into overload mode
have an accredited electrician calculate your maximum load requirement for an external power supply and then get a unit that is at least 15.. kva kw better that required
generally fridges use 1000watts , ac conditions will draw over 3000watts and any thing else adds up . I am guessing that your generator is only 2500 unit
When you get the under speed alarm is the generator under load? Try manually starting the generator with no load and let it run for a while, if no alarm, then put it under your home load and measure current draw (maybe have an electrician check it) if the amp draw and in rush caused by compressors, pumps motors etc are within the generator rating, check your fuel pressure, on average 8-11 WC Nat gas. Pressure may test well under no load but drop starving the engine of fuel unde rload. Underspeed is just that engine cannot make RPM/Frequency
The rating of floor heater is 2500 watts, but how many amps are they pulling? Is the amp rating of heater higher than amp rating of generator? Just an idea. I have run into this on generators before as well.
Make sure all the springs that go to the carb and govenor are in place. some of them are just used to keep the linkage tight so there isn't any play. Another possibility is that the mixture on the carb is not set right. If you have an adjustment for the mixture, you can try to adjust it. With the engine running and warmed up. Turn the main jet adjustment screw (usually located at the bottom of the bowl) in till the engine RPM's start to drop. Then back it out til the engine runs smooth again. I would back it out another 1/4 turn and try it there. They tend to run better if they are set a little on the rich side.
its possible the overspeed is set to sensitive.
or your rpm are to high.
these are preset in the factory as a safety, check your manual to ensure your rpm speed is in
the pre set area.
generators will do this under load when you have a big load on them or take a load off.
the governor will some times over compensate causing it to trip on overspeed.
Make sure the governor is working properly. When you put a load on it the engine should increase in speed slightly. Make sure the engine is running at the correct speed 3600 rpm. Try plugging in an item that draws less power such as a electric drill and see how the generator behaves. Also make sure the engine runs smooth while not under any load. Check the voltage from the outlet to make sure it is putting out 132 volts not under load.